Fox shark - fox fighting fish. Common sea fox sea fox shark

The fox shark is an interesting representative of the ocean depths. This is a large cartilaginous fish whose body shape resembles a torpedo. Three species of predators are referred to the genus. They all have characteristic features  body structure and behavior.

What is the name related to?

The genus of sharks got its unusual name due to the long tail, or rather, the top of the caudal fin. The upper segment can make up almost half of the entire length of the predator. In addition to dimensions, the tail has another feature - the elongated tail lobe is flexible and mobile. The English, observing the hunt of a predator, gave it the most accurate name: thresher shark. Literally, it sounds like a thresher shark. This is due to the extraordinary way of hunting.

Unusual hunt

The fox shark is not exchanged for trifles: it does not chase individual victims, but prefers a plentiful “restaurant” menu. During the hunt, the predator drives the frightened prey into a dense jamb, crashes into it and begins to "thresh" in different directions with a long tail. Then he slowly dines with stunned fish. Given the size of the predator, one can imagine the power of such a “thresher”. Fishermen who managed to catch an amazing shark complained that the fish pulled out of the usual environment onto the deck managed to smash and break everything that it reached with its tail.

Appearance

Since the tail is the most prominent part of this species, the description of the appearance of a predator almost always begins with it. However, it is worth noting that the fox shark is the most impressive representative of cartilaginous fish. It has an elongated torpedo-shaped body shape, a wide head and a pointed muzzle. For breathing, the underwater inhabitant has 5 paired gill slits. Two extreme slots are located above the pectoral fins. The fins themselves are pointed and long. The fox shark has a small curved mouth with labial depressions. The teeth of the predator are small, and their edges are smooth.

Anal and dorsal fins, unlike caudal, are small. Different have small differences in the size and color of the fins.

Taxonomy of species

The family of sea foxes is divided into 3 species:

  1. Alopias vulpinus, that is, an ordinary sea fox.
  2. Alopias superciliosus is a deep fox shark called the big-eyed fox.
  3. Alopias pelagicus, a species of pelagic (toothed) foxes.

In 1995, a fish was discovered in the waters of California, which they wanted to designate as the fourth species, but there was no confirmation of this theory, and the fourth species remained unrecognized.

The main differences. Common fox

It has a streamlined body with a clear bend of the back. She has a cone-shaped short head with medium-sized eyes, devoid of the third century. The teeth of the predator are small, canine-like, slightly flattened. The average size of sharks is about five meters. At the same time, a maximum was recorded - more than 7 m, and a minimum - less than four.

The color of the body of the shark is heterogeneous. Caught individuals and dark brown, and blue-gray, and steel. Some fish had a black back and a light belly.

Deep-sea big-eyed fox

Despite the body structure typical of fox sharks, this representative is easily recognizable by the size of her eyes. The big-eyed fox shark fully lives up to its name. In some individuals, the eye diameter reaches 10 cm. The peculiarity of the location of the organ in the orbit allows the predator to see not only the front and sides, but also to view the space above the head.

Another distinctive feature of the species is the special lateral grooves. They are formed at the place where the trunk passes into the head, pass over the gill slits and orbits.

The teeth of the big-eyed fox shark are larger than those of other species. They have one vertex and are the same size on the top and on lower jaw.

The body color is brown-purple, the belly is always lighter than the back. The dorsal fin is displaced to the tail.

Pelagic fox

The color is dark: most often these are various shades of blue and gray. Shark belly is much lighter.

The species has well-developed pectoral, caudal, and dorsal fins. But at the same time, the second dorsal and anal fin are very small. The elongated tail lobe is narrower than that of other species.

Habitat and diet

The fox shark has a wide range. It is found in the tropics and temperate latitudes. The pelagic species is characterized by an existence remote from coastlines. This species lives in the surface layers and at depths of up to 150 m.

The big-eyed fox prefers a more serious depth. She is comfortable at 500 m below the surface.

They love the coastal zone, but they feel good and far from the earth. This species prefers surface layers, but can dive up to 500 meters.

Fox sharks do not attack too large prey, since the basis of their diet are schooling fish. We have already talked about hunting habits of this kind, but this does not mean that predators cannot make exceptions. In the absence of fish schools, the fox shark diet can have any living creature. The man, most likely, will simply be stunned by the tail - the shark will not dare to dine with such an unpredictable opponent.

Genus: Alopias Rafinesque \u003d Fox Sharks, Sea Foxes

Species: Alopias vulpinus (Bonnaterre, 1788) \u003d Common Sea Fox

Common Sea Fox \u003d Alopias vulpinus

The common sea fox (Thresher Shark) was first described by Bonnaterre in 1788 as Squalus vulpinis and later the name was changed to its current name: Alopias vulpinus (Bonaterre, 1788). The word Vulpinus is derived from "fox" - Latin vulpes.

Synonymous names include Squalus vulpes Gmelin 1789, Alopias macrourus Rafinesque 1810, Galeus vulpecula Rafinesque 1810, Alopias caudatus Philipps 1932, Alopas grayyi Whitely 1937 and others.

It is also called: Fox Shark, Sea Fox, Common thresher, Fish shark, Fox shark, Longtail shark, Sea fox, Swingtail, Swiveltail, Thresher, Thresher shark, Whiptail shark

Common sea fox is widespread in all oceans, mainly in temperate and subtropical zones. In the warm season, this shark makes migrations to the temperate seas. AT Atlantic ocean  for example, it reaches the St. Lawrence Bay and the Lofoten Islands (Northern Norway) in summer.

In the western Atlantic, it occurs from Newfoundland to Cuba and from southern Brazil to Argentina. In the eastern Atlantic from Norway and the British Isles to Ghana and the Ivory Coast, including the Mediterranean Sea.

In the Indo-Pacific region, it is found in the waters of South Africa, Tanzania, Somalia, Maldives, the Chagos Archipelago, the Gulf of Aden, Pakistan, India, Sri Lanka, Sumatra, Japan, the Republic of Korea, Australia, New Zealand, and New Caledonia. The shark is also found in the Islands of Oceania, Hawaii, and in the eastern Pacific region - from the coast of British Columbia through central California and Panama to the south to Chile.

The common sea fox lives in tropical and temperate waters, and is found both in the open ocean and near the coast. It usually stays in the surface layers of water, sometimes jumping over the surface.

Sea fox prefers cool sea water, but can also wander in cold coastal areas. It is capable of immersing, if necessary, to a depth of 350 m.

Sea fox is a typical pelagic shark. The common sea fox reaches 5-6 m in length. The maximum recorded length is 760 cm. Adult marine foxes weigh between 200-350 kg. The maximum weight is about 450 kg. It has small jaws, but can use its tail to drive and even kill fish. Their tail keel has a very elongated upper lobe. The pectoral fins are crescent, narrow, and curved. Like other sharks, it has an anal fin, 5 incisions of gill slits, 2 dorsal fins without any internal skeleton, mouth located behind the eyes, and eyes without blinking eyelids.

The sea fox has a bit, a blade of similar, smooth twisted teeth. There are 20 teeth on both sides of the upper jaw and 21 teeth on both sides of the lower jaw. Teeth from a specimen caught off the Massachusetts coast were nearly 13 feet long.

The body of an ordinary sea fox with a brown, gray or black back and with a light belly, but there are dark spots near the pelvic fin and the beginning of the tail. The sides of the body are above the base of the pectoral fins with a white patch that extends forward from the abdominal region.

Large sharks attack young sea foxes, but adults have no known predators. The common sea fox lives for 20 years or more.

The usual food of the sea fox is made up of various schooling fish, which it devours in large numbers.

Bony fish make up 97% of the sea fox diet. Blue fish and butterfish are the most common food. They also feed on mackerel, herring, mackerel and other species.

The teeth are small, but strong and sharp, they are able to grab not only a variety of small fish, but also squid, octopus, crab, and even sea bird.

By way of life, the sea fox is a pelagic, multi-migratory species, leading a nocturnal lifestyle. It is a marine species inhabiting both coastal and ocean water. Most often, it is observed far from the coast, despite the fact that it often runs close to the coast in search of food. Adults are common over the continental shelf, while young people live in coastal bays and near a water edge.

The common sea fox uses its long tail as the main weapon during hunting. Approaching a school of fish, the sea fox begins to circle around him, foaming the water with whip-like strokes of the caudal fin. Gradually, the circles become smaller and smaller, and the frightened fish gathers in an increasingly compact group. It is then that the shark begins to eagerly swallow its prey. A couple of sea foxes is sometimes involved in such a hunt.

In some cases, the sea fox acts by the tail fin as a flail, using it to stun its prey. Such a sacrifice is far from always a fish. In particular, they observed how a shark attacked seabirds sitting on the surface of the water in this way. Accurate tail punch - and the unfolding shark grabs its not quite ordinary prey.

In the stomach of one specimen, about 4 m long, for example, 27 large mackerels were found.

They are very strong swimmers, so they can jump almost entirely out of the water.

Reproduction occurs by egg-laying (females lack a placenta), and the fertility of this shark is very small - the female brings only two to four sharks, though very large. Their length at birth can reach 1.1 - 1.5 m, and weight between 5-6 kg.

The time of birth is confined to the warm summer time of the year. Females give birth to 4-6 cubs. Sharks (more precisely - shark embryos) hatch from eggs while still inside the female. Developing embryos are ovophages; they will eat smaller, weaker shark embryos while in the uterus.

On average, young sharks grow by 50 cm per year, while adults grow by about 10 cm.

Females become sexually mature with a body length of at least 2.6-3.5 m, males - 3.3 m.

Sea foxes are not aggressive and pose no threat to human life, but an attack can be triggered. Sharks are shy and hard to get close. Divers who encountered these sharks claim that they did not act aggressively. Two provoked attacks of these sharks on boats with people are known. The large tail of a sea fox during an attack can damage divers.

They have some commercial value, sometimes caught in the by-catch of tuna. Sea fox meat and fins are of good commercial quality. Their skin is used for the skin, and fat from their liver can be used to produce a number of vitamins.

The total abundance of common sea fox is reduced due to depletion of fish stocks. The abundance of sharks in American Atlantic water decreased to about 67% of the previous abundance.

About the range, status and abundance of the sea fox in the Mediterranean Sea: Common or frequent. Everywhere in the western Mediterranean to Sicily; somewhat less frequently from southern Tunisia and an increasingly sporadic view further east to Libya and Egypt. Sicilian and Maltese straits - sometimes local abundance. Cosmopolitan in the Ionian Sea, also on both sides of the Adriatic where the sea fox is found off the northern coasts; the coast of the Balkan Peninsula, Aegean Sea, Turkey, Dodecanese and Cyprus; more rare view  off the coast of Lebanon and Israel.

Yandex.Taxi will launch a freight service
The new service will provide an opportunity to order transportation at two rates. You can also use the service of a loader. The first tariff allows you to order a car (Citroen Berlingo and Lada Largus) with a cargo compartment with a total carrying capacity of not more than 1 ton. The second tariff includes small vans with a carrying capacity of up to 3.5 tons, for example, Citroen Jumper and GAZelle NEXT. Cars will not be older than 2008, Kommersant reports.
Also, customers will be able to order transport with loaders, but if the driver works alone, he will not receive such orders. Yandex.Taxi promises “special bonuses for some partners and drivers” who have connected to the new tariff.

Shark fox  (the second name is "sea fox", the Latin name is "Alopias vulpinus") - this is a species sea \u200b\u200bsharks, which belongs to the family Fox Sharks, the order Lamiform.

Signs
  Sea foxes are large sharks whose body length averages 3 meters; specimens up to 5 meters long are known. The upper body is painted in a dark gray-blue color, the belly is white. The average weight of fox sharks is 300 kilograms (the maximum weight is 500 kilograms).

Distinctive a sign  sea \u200b\u200bfoxes is their caudal fin, the upper lobe of which is incredibly large, sometimes exceeding the length of the body of the fish itself. Such a tail is necessary for fish to hunt. Ichthyologists claim that a sea fox can stun schools of fish and even birds and small ones with its tail ladle. marine mammals. In search of food, the shark rises to the surface of the water and, seeing potential food, strongly strikes its tail fin on the sea surface.

Habitat

Fox sharks inhabit the basins of the Pacific and Atlantic oceans. They prefer to stay in tropical waters, but they often swim in the waters of temperate latitudes.

Danger !!!

This species of sharks does not represent great danger  for a person. However, cases of the attack of these sharks on humans have been described. Sea foxes usually hunt collectively, that is, they gather 3–5 individuals and surround schools of fish, kill them with their tails, and then the center of accumulation of fish rushes together. It is in moments of collective hunting that the fox sharks are the most dangerous. During the chase, they rush after any moving object in the water.

Waters, although they prefer a cool temperature. They are found both in the open ocean to a depth of 550 m, and near the coast and usually stay in the surface layers of water. Fox sharks perform seasonal migrations and spend summers at lower latitudes.

The diet consists mainly of schooling pelagic fish. Fox sharks hunt using their long tail as a whip. They knock down, drive and stun them prey, this explains their English name English. thresher shark, which literally translates as "thresher shark." These are powerful and fast predators capable of jumping out of the water completely. Their circulatory system is modified in such a way as to maintain metabolic thermal energy  and heat the body above ambient temperature. Reproduction occurs through placental live birth. In the litter up to 4 newborns.

Despite its large size, it is believed that fox sharks are not dangerous for humans, because they are shy and have small teeth. This species is the subject of commercial fishing and sport fishing. Their meat and fins are highly regarded. The low level of reproduction makes common sea foxes very sensitive to overfishing.

Taxonomy



Megachasmidae



  Alopiidae

Alopias vulpinus




undescribed view Alopias  sp.











The species was first scientifically described as Squalus vulpinus  in 1788, by the French naturalist Pierre Joseph Bonnaterre. In 1810, Constantin Samuel Rafinesk described Alopias macrourus  based on an individual caught off the coast of Sicily. Later authors recognized the existence of a separate genus of fox sharks and synonymous Alopias macrourus  and Squalus vulpinus. Thus, the scientific name of the fox shark became Alopias vulpinus .

Generic and species names come from the words Greek. ἀλώπηξ   and lat. vulpes, each of which means "fox". In old sources, this species is sometimes called Alopias vulpes .

Morphological and allozyme analysis revealed that the fox shark is a basal member of the clade, which also includes the big-eyed and pelagic fox sharks. The possibility of the existence of a fourth still undescribed species belonging to the genus of fox sharks and the most closely related Alopias vulpinuswas rejected after an allozyme analysis conducted in 1995.

Area

The range of common sea foxes covers temperate and tropical waters around the world. In the western Atlantic, they are common from Newfoundland to the Gulf of Mexico, although they rarely appear off the coast of New England, as well as from Venezuela to Argentina. In the eastern Atlantic Ocean, they live from the North Sea and the British Isles to Ghana, including Madeira, Azores and the Mediterranean Sea, as well as from Angola to South Africa. In the Indo-Pacific region, fox sharks are found from Tanzania to India, in the Maldives, off the coast of Japan, Korea, southeast China, Sumatra, the east coast of Australia and New Zealand. They also come across numerous Pacific islands, including New Caledonia, Society Islands, Tabuaeran and Hawaii. In the eastern Pacific, they are found in coastal waters from British Columbia to Chile, including the Gulf of California.

Fox sharks make seasonal migrations, moving to high latitudes after the masses of warm water. In the eastern Pacific Ocean, males make longer migrations than females in late summer and early fall, reaching Vancouver Island. Young sharks prefer to stay in natural nurseries. Probably, in the eastern part of the Pacific Ocean and in the western part of the Indian Ocean, there are separate populations with different life cycles. Interoceanic migrations are absent. In the northwestern part of the Indian Ocean from January to May, when offspring are born, territorial and vertical segregation by sex is observed. Analysis of mitochondrial DNA revealed significant regional genetic variations of fox sharks that live in different oceans. This fact confirms the hypothesis that sharks from different habitats, despite migrations, do not interbreed.

Despite the fact that fox sharks are sometimes seen in the coastal zone, they mainly lead a pelagic lifestyle and prefer to stay on the high seas, descending to a depth of 550 m. Young sharks can often be found in shallow water near the coast.

Description

A characteristic feature of fox sharks is a very elongated upper lobe of the caudal fin, the length of which can equal the length of the body. Common sea foxes are active predators; with the help of the tail, they are able to stun the victim. They have a strong torpedo-shaped body and a short, wide head with a conical, pointed snout. There are 5 pairs of short gill slits, with the last two cracks located above the long and narrow pectoral fins. The mouth is small, curved in the form of an arch. In the mouth there are 32-53 upper and 25-50 lower dentitions. The teeth are small, without nicks. The eyes are small. The third eyelid is absent.
  Long crescent pectoral fins narrow to narrow pointed tips. The first dorsal fin is rather high and is located closer to the base of the pectoral fins. The ventral fins are approximately the same size as the first dorsal fin; males have thin, long pterygopodia. The second dorsal and anal fins are tiny in size. In front of the caudal fin there is a crescent-shaped dorsal and ventral notches. At the edge of the upper lobe there is a small ventral notch. The lower lobe is short, but developed.

The skin of fox sharks is covered with small, overlapping placoid scales, each of which bears 3 ridges. The posterior edge of the scales ends with 3-5 marginal teeth. The dorsal surface of the body is metallic lilac-brown to gray, the sides are bluish, and the belly is white. The white color extends to the base of the pectoral and ventral fins - this distinguishes fox sharks from similar to the pelagic fox sharks, in which there are no spots at the base of the fins. White edging of the pectoral fin tips is possible.

Ordinary sea foxes are the largest representative of the family, they reach a length of 7.6 m and a mass of 510 kg.

Biology

Nutrition

97% of the diet of ordinary sea foxes consists of bony fishes, mainly small and schooling such as bluefin, mackerel, herring, garfish and luminous anchovies. Before attacking, sharks circle around the school and compact it with blows of the tail. Sometimes they hunt in pairs or in small groups. In addition, large solitary fish, such as sawtooths, as well as squids and other pelagic invertebrates, can become their prey. Off the coast of California, they prey mainly on California anchovies Engraulis mordax, oregon hake Merluccius productus, Peruvian sardine, Japanese mackerel, squid Loligo opalescens  and crab Pleuroncodes planipes. During the cold oceanographic regime, the composition of their diet is poorer, while during periods of warming the food spectrum expands.

There are numerous reports of fox sharks using the upper lobe of the caudal fin to stifle prey. Repeated cases have been recorded when, when striking, they caught their tail behind a tier. In July 1914, Russell J. Coles witnessed how an ordinary sea fox sent a prey to the mouth with a flick of the tail, and if it missed, the fish flew a considerable distance. On April 14, 1923, the oceanographer W.E. Allen, standing on the pier, heard a loud splash nearby and saw at 100 meters a swirl of water that a diving sea lion could produce. A moment later, a meter-long flat tail rose above the surface of the water. Further, the scientist watched as a fox shark pursued the California atherina. Atherinopsis californiensis. Having overtaken the prey, she whipped her tail, like a coachman's whip, and severely injured her. In the winter of 1865, Irish ichthyologist Harry Blake-Knox watched as an ordinary sea fox whipped a wounded loon (possibly a black-headed loon), which it then swallowed in the Dublin Bay. Subsequently, the reliability of the Blake-Knox report was questioned on the basis that the tail of the fox shark is not rigid or muscular enough to deliver such a blow.

Life cycle

  Fox sharks breed by egg-laying. Mating occurs in the summer, usually in July and August, and childbirth takes place from March to June. Pregnancy lasts 9 months. Fertilization and development of embryos occurs in utero. After emptying the yolk sac, the embryo begins to feed on unfertilized eggs (intrauterine oophagia). The teeth of the embryos are in the form of pegs and are not functional because they are covered with soft tissue. As they develop, they become more and more similar in shape to the teeth of adult sharks and “erupt” shortly before birth. In the eastern part of the Pacific Ocean, the number of litter varies from 2 to 4 (rarely 6) newborns, and in the eastern part of the Atlantic - from 3 to 7.

The length of newborns is 114-160 cm and depends on the size of the mother. Young sharks add 50 cm per year, while adults grow only 10 cm. The age at which puberty is reached depends on the habitat. In the north-eastern part of the Pacific Ocean, males mature at a length of 3.3 m, which corresponds to the age of 5 years, and females at a length of 2.6-4.5, which corresponds to the age of 7 years. Life expectancy of at least 15 years, and the maximum period is about 45-50 years.

Human interaction

Despite its large size, it is believed that ordinary sea foxes are not dangerous. They are timid and immediately swim away when a person appears. Divers testify that it is difficult to approach them. The International Shark Attack File recorded one provoked attack of a fox shark on a person and 4 attacks on boats, probably committed by hooked sharks. There is unconfirmed evidence of an attack on a harpooner off the coast of New Zealand.
  Famous athlete-fisherman Frank Mandas in his book Sportsfishing for Sharks  retold the old story. One ill-fated fisherman leaned over the side of the boat to look at big fishcaught on his hook. At that moment, he was beheaded by a tail strike with a five-meter shark fox. The fisherman's body capsized into the boat, and his head fell into the water and could not be found. Most authors consider this story unreliable.

Ordinary sea foxes are the subject of commercial fishing in Japan, Spain, the USA, Brazil, Uruguay, Mexico and Taiwan. They are mined in tiers, pelagic and gill nets. Meat, especially fins, is much appreciated. It is consumed fresh, dried, salted and smoked. The skin is made, vitamins are made from liver fat.

In the United States, commercial fishing for fox sharks using floating gill nets on the South Carolina coast has been developing since 1977. Fishing began with 10 vessels that used large-mesh networks. For 2 years, the fleet totaled 40 ships. The peak occurred in 1982, when 228 vessels caught 1,091 tons of fox sharks. After that, their numbers decreased sharply due to overfishing, and in the late 80s, production decreased to 300 tons, large individuals stopped coming across. In the United States, fox sharks are still caught, with 80% of the catch being caught in the Pacific Ocean, and 15% in the Atlantic. Most fox sharks are still caught using gillnets off the coast of California and Oregon, although the main target there is the more valuable swordfish. Xiphius gladiusand fox sharks are caught as by-catch. A small number of these sharks are caught in the Pacific Ocean using harpoons, fine-mesh drift nets and longlines. In the Atlantic, fox sharks are more likely to be caught as by-catch when fishing for swordfish and tuna.

Due to the low fecundity, representatives of the genus of fox sharks are very susceptible to overfishing. For the period from 1986 to 2000, according to the analysis of the pelagic longline catch, in the northwestern Atlantic the number of common sea fox and big-eyed fox shark decreased by 80%.

Fox sharks are valued by fishermen along with mako sharks. They are caught on a fishing rod with a bobbin reel. As bait using bait.

Since the 1990s, there has been a restriction on fox shark hunting in the USA. It is legally forbidden to cut fins from live sharks by throwing carcass overboard. In the Mediterranean Sea, there is a ban on the use of drift nets, but poachers illegally use such nets up to 1.6 km long when fishing for swordfish. The International Union for Conservation of Nature has assigned this species the status “Vulnerable”.

Write a review on the Ordinary Sea Fox

Notes

  1.   in the FishBase database (Retrieved August 27, 2016).
  2. Life of animals. Volume 4. Lancelet. Cyclostomes. Cartilaginous fish. Bone fish / ed. T. S. Race, Ch. ed. V. E. Sokolov. - 2nd ed. - M.: Education, 1983 .-- S. 31 .-- 575 p.
  3. Gubanov E.P., Kondyurin V.V., Myagkov N.A. Sharks of the World Ocean: A Guide-Determinant. - M.: Agropromizdat, 1986. - S. 59. - 272 p.
  4. Reshetnikov Yu.S., Kotlyar A.N., Russ T.S., Shatunovsky M.I.  The bilingual dictionary of animal names. Fishes. Latin, Russian, English, German, French. / edited by Acad. V. E. Sokolova. - M.: Rus. Yaz., 1989 .-- P. 22 .-- 12,500 copies. - ISBN 5-200-00237-0.
  5. Animal Life: in 6 volumes / Ed. professors N. A. Gladkov, A. V. Mikheev. - M.: Enlightenment, 1970.
  6. : IUCN Red Book website information
  7.   in the FishBase database
  8. Bonnaterre, J. P.  (1788). Tableau encyclopédique et methodique des trois règnes de la nature. Panckoucke. pp. 9.
  9. Compagno, L. J. V.  Sharks of the World: An Annotated and Illustrated Catalog of Shark Species Known to Date (Volume 2). - Food and Agriculture Organization of the United Nations, 2002. - P. 86-88. - ISBN 92-5-104543-7.
  10. . Retrieved January 7, 2015.
  11. . Retrieved January 7, 2015.
  12. Ebert, D. A. Sharks, Rays, and Chimaeras of California. - California: University of California Press, 2003 .-- P. 105-107. - ISBN 0520234847.
  13. Eitner, B.  Systematics of the genus Alopias  (Lamniformes: Alopiidae) with Evidence for the Existence of an Unrecognized Species (Eng.) // Copeia (American Society of Ichthyologists and Herpetologists). - 1995. - Vol. 3. - P. 562-571. - DOI: 10.2307 / 1446753.
  14. . FAO Fisheries and Agriculture Department. Retrieved January 18, 2015.
  15. Martin, R.A.  . ReefQuest Center for Shark Research. Retrieved January 5, 2013.
  16. Trejo, T.  (2005). "Global phylogeography of thresher sharks (Alopias spp.) Inferred from mitochondrial DNA control region sequences." M.Sc. thesis. Moss Landing Marine Laboratories, California State University.
  17. Jordan V.  . Florida Museum of Natural History .. Retrieved January 7, 2013..
  18. Castro, J. I.  The Sharks of North America. - Oxford University Press, 2011 .-- P. 241-247. - ISBN 9780195392944.
  19. Douglas, H.   (English) // Newsletter of the Porcupine Marine Natural History Society. - 2007. - No. 23. - P. 24-25.
  20. Leonard, M. A.  . University of Florida Museum of Natural History. Retrieved January 6, 2013..
  21.   (eng.). ReefQuest Center for Shark Research. Retrieved January 5, 2013.
  22. Weng, K. C. and Block, B. A.   (English) // Fishery Bulletin - National Oceanic and Atmospheric Administration. - 2004. - Vol. 102, no. 1 . - P. 221-229.
  23. Visser, I. N.  First observations of feeding on thresher ( Alopias vulpinus) and hammerhead ( Sphyrna zygaena) sharks by killer whales ( Orcinus orca) specializing on elasmobranch prey (English) // Aquatic Mammals. - 2005. - Vol. 31, no. 1 . - P. 83-88. - DOI: 10.1578 / AM.31.1.2005.83.
  24. Lasek-Nesselquist, E .; Bogomolni, A. L .; Gast, R. J .; Welch, D. M .; Ellis, J. C .; Sogin, M. L .; Moore, M. J.  Molecular characterization of Giardia intestinalis haplotypes in marine animals: variation and zoonotic potential // Diseases of Aquatic Organisms. - 2008. - Vol. 81, No. 1. - P. 39-51. - DOI: 10.3354 / dao01931. - PMID 18828561.
  25. Adams, A. M .; Hoberg, E. P .; McAlpine, D. F .; Clayden, S. L.  Occurrence and morphological comparisons of Campula oblonga (Digenea: Campulidae), including a report from an atypical host, the thresher shark, Alopias vulpinus // Journal of Parasitology. - 1998. - Vol. 84, No. 2. - P. 435-438.
  26. Shvetsova, L. S.  Trematodes of cartilaginous fishes of the Pacific Ocean // Izvestiya TINRO. - 1994. - Vol. 117. - P. 46-64.
  27. Parukhin, A. M. On the species composition of the helminth fauna of fishes in the South Atlantic // Materials of the Scientific Conference of the All-Union Society of Helminthologists. - 1966. - Issue. 3. - S. 219-222.
  28. Yamaguti, S.  (1934). “Studies on the Helminth fauna of Japan. Part 4. Cestodes of fishes. " Japanese Journal of Zoology 6 : 1-112.
  29. Euzet, L.  (1959). "Recherches sur les cestodes tetraphyllides des selaciens des cotes de France." Theses de Ph.D. Faculte des Sciences, Université de Montpellier.
  30. Bates, R. M.  (1990). "A checklist of the Trypanorhyncha (Platyhelminthes: Cestoda) of the world (1935-1985)." National Museum of Wales, Zoological Series 1 : 1-218.
  31. Ruhnke, T. R.  "Paraorygmatobothrium barberi n. g., n. sp. (Cestoda: Tetraphyllidea), with amended descriptions of two species transferred to the genus ”// Systematic Parasitology. - 1994. - Vol. 28, No. 1. - P. 65-79. - DOI: 10.1007 / BF00006910.
  32. Ruhnke, T. R.  (1996). "Systematic resolution of Crossobothrium Linton, 1889, and taxonomic information on four allocated to that genus." Journal of parasitology 82 (5): 793-800.
  33. Gomez Cabrera, S.  (1983). "Forma adulta de Sphyriocephalus tergetinus (Cestoda: Tetrarhynchidea) en Alopias vulpinus (Peces: Selacea)." Revista Iberica de Parasitologia 43 (3): 305.
  34. Cressey, R. F.  (1967). "Revision of the Family Pandaridae (Copepoda: Caligoida)." Proceedings of the United States National Museum 121 (3570): 1-13.
  35. Izawa, K.  Free-living stages of the parasitic copepod, Gangliopus pyriformis Gerstaecker, 1854 (Siphonostomatoida, Pandaridae) reared from eggs // Crustaceana. - 2010 .-- Vol. 83, No. 7. - P. 829-837. - DOI: 10.1163 / 001121610X498863.
  36. Deets, G. B.  Phylogenetic analysis and revision of Kroeyerina Wilson, 1932 (Siphonostomatoida: Kroyeriidae), copepods parasitic on chondrichthyans, with descriptions of four new species and the erection of a new genus, Prokroyeria // Canadian Journal of Zoology. - 1987. - Vol. 65, No. 9. - P. 2121-2148. - DOI: 10.1139 / z87-327.
  37. Hewitt G. C.  (1969). "Some New Zealand parasitic Copepoda of the family Eudactylinidae." Zoology Publications from Victoria University of Wellington 49 : 1-31.
  38. Dippenaar, S.M .; Jordaan, B.P.  "Nesippus orientalis Heller, 1868 (Pandaridae: Siphonostomatoida): descriptions of the adult, young and immature females, a first description of the male and aspects of their functional morphology" // Systematic Parasitology. - 2006. - Vol. 65, No. 1. - P. 27-41. - DOI: 10.1007 / s11230-006-9037-7.
  39. Preti, A., Smith, S. E. and Ramon, D. A. // California Cooperative Oceanic Fisheries Investigations Report. - 2004. - Vol. 4. - P. 118-125.
  40. Shimada, K.  "Teeth of embryos in lamniform sharks (Chondrichthyes: Elasmobranchii)." Environmental Biology of Fishes. - 2002. - Vol. 63, No. 3. - P. 309-319. - DOI: 10.1023 / A: 1014392211903.
  41. Mazurek, R.  (2001). Seafood Watch Fishery Report: Sharks Volume I Common Thresher. MBA SeafoodWatch.
  42. . FishWatch - U.S. Seafood Facts. Retrieved January 7, 2013..
  43. . FishWatch - U.S. Seafood Facts. Retrieved January 7, 2013..
  44. Baum, J. K., Myers, R. A., Kehler, D. G., Worm, B., Harley, S. J. and Doherty, P. A.  (2003). Collapse and conservation of shark populations in the Northwest Atlantic. Science 299 : 389-392.
  45. Cacutt, L.  The Big-Game Fishing Handbook .. - Stackpole Books., 2000. - ISBN 0-8117-2673-8.
  46. Rudow, L.  Rudow's Guide to Fishing the Mid Atlantic: Coastal Bays and Ocean. - Geared Up Publications, 2006. - ISBN 0-9787278-0-0.

References

  • akyla.info/vidy_lis/4.html
  • View in the World Register of Marine Species ( World Register of Marine Species) (English)

Excerpt from Common Sea Fox

But despite the fact that this evening Natasha, now excited, sometimes frightened, with stopping eyes, lay for a long time in her mother’s bed. Either she told her how he praised her, how he said that he would go abroad, what he asked where they would live this summer, how he asked her about Boris.
  “But such, such ... never happened to me!” She said. - Only I am scared with him, I am always scared with him, what does this mean? So it's real, right? Mom, are you sleeping?
  “No, my soul, I myself am scared,” answered the mother. - Go on.
  “I won’t sleep anyway.” What nonsense to sleep? Mother, mother, this has never happened to me! She said in surprise and fear before the feeling that she was aware of in herself. “And could we think! ...”
  It seemed to Natasha that when she first saw Prince Andrei in Otradnoye, she fell in love with him. It seemed that she was frightened by this strange, unexpected happiness, that the one whom she had chosen back then (she was firmly convinced of this), that he had now met her again, and, it seemed, was not indifferent to her. “And he had to purposely now, when we are here, come to Petersburg. And we had to meet at this ball. All this is fate. It is clear that this is fate, that all this was led to this. Even then, as soon as I saw him, I felt something special. "
“What else did he tell you?” What verses are these? Read ... - said the mother thoughtfully, asking about the verses that Prince Andrei wrote to Natasha’s album.
  - Mom, is it not a shame that he is a widower?
  - That's it, Natasha. Pray to God. Les Marieiages se font dans les cieux. [Marriages are made in heaven.]
  - Dear, mother, how I love you, how good I am! Natasha shouted, crying with tears of happiness and excitement and hugging her mother.
  At the same time, Prince Andrei sat with Pierre and told him of his love for Natasha and his firmly taken intention to marry her.

On this day, Countess Elena Vasilievna had a rout, had a French envoy, had a prince, who had recently become a frequent visitor to the Countess’s house, and many brilliant ladies and men. Pierre was downstairs, walked through the halls, and struck all the guests with his concentrated, diffused and gloomy look.
  Pierre from the time of the ball felt the approach of attacks of hypochondria and with a desperate effort tried to fight against them. From the time the prince approached his wife, Pierre was unexpectedly confined to the chamberlain, and from that time he began to feel heaviness and shame in a large society, and more often he began to come back with gloomy thoughts about the futility of everything human. At the same time, the feeling he noticed between the patronage of Natasha and Prince Andrei, his opposition to his position and that of his friend, reinforced this gloomy mood. He equally tried to avoid thoughts of his wife and of Natasha and Prince Andrew. Again, everything seemed to him insignificant in comparison with eternity, again the question arose: "why?" And he forced himself day and night to work on Masonic works, hoping to drive away the approach of an evil spirit. Pierre at 12 o’clock, leaving the Countess’s chambers, sat upstairs in his smoky, low room, in a worn dressing gown in front of the table, and rewriting genuine Scottish acts when someone entered his room. It was Prince Andrew.
  “Ah, it's you,” said Pierre with a distracted and displeased look. “And here I am working,” he said, pointing to a notebook with that kind of salvation from the hardships of life with which unhappy people look at their work.
  Prince Andrew, with a radiant, enthusiastic and renewed face to life, stopped in front of Pierre and, not noticing his sad face, smiled at him with an egoism of happiness.
  “Well, my soul,” he said, “I wanted to tell you yesterday and now came to you for this.” Never experienced anything like it. I'm in love, my friend.
Pierre suddenly sighed heavily and fell with his heavy body on the sofa, next to Prince Andrew.
  - To Natasha Rostov, right? - he said.
  - Yes, yes, in whom? I would never have believed it, but this feeling is stronger than me. Yesterday I suffered, suffered, but I will not give up this torment for anything in the world. I have not lived before. Now only I live, but I cannot live without her. But can she love me? ... I'm old for her ... What aren't you saying? ...
  - I AM? I AM? What did I tell you, ”Pierre suddenly said, getting up and starting to walk around the room. - I always thought that ... This girl is such a treasure, such ... This is a rare girl ... Dear friend, I ask you, you don’t be in doubt, get married, get married and get married ... And I’m sure that you will not be happier than a person.
  - But she!
  “She loves you.”
  “Don't talk nonsense ...” said Prince Andrei, smiling and looking into Pierre’s eyes.
  “He loves, I know,” Pierre cried angrily.
  “No, listen,” said Prince Andrew, stopping his hand. “Do you know what position I am in?” I need to tell everyone to someone.
  “Well, well, say, I'm very happy,” Pierre said, and his face really changed, his wrinkles smoothed, and he joyfully listened to Prince Andrei. Prince Andrei seemed and was a completely different, new man. Where was his longing, his contempt for life, his disappointment? Pierre was the only person to whom he dared to speak; but then he expressed to him everything that he had in his soul. That he easily and boldly made plans for a long future, talked about how he can not sacrifice his happiness for the whim of his father, how he will force his father to agree to this marriage and love her or will do without his consent, then he was surprised how something strange, alien, independent of him, on that feeling that possessed him.
  “I would not believe someone who would tell me that I can love that way,” said Prince Andrei. “This is not at all the feeling I had before.” The whole world is divided for me into two halves: one is it and there is all the happiness of hope, light; the other half - everything where it does not exist, there is all gloom and darkness ...
  “Darkness and darkness,” Pierre repeated, “yes, yes, I understand that.”
  - I cannot but love the light, I am not to blame for this. And I am very happy. You understand me? I know that you are happy for me.
  “Yes, yes,” Pierre confirmed, looking with touching and sad eyes at his friend. The brighter the fate of Prince Andrew seemed to him, the darker seemed his own.

For marriage, the consent of the father was necessary, and for this the next day, Prince Andrei left for his father.
The father, with outward calm, but with inner malice, accepted the message of his son. He could not understand that anyone wanted to change life, to bring something new into it when life for him was already over. “They would only give me the chance to live as I want, and then they would do what they wanted,” the old man told himself. With his son, however, he used the diploma that he used in important cases. Taking a calm tone, he discussed the whole matter.
  Firstly, the marriage was not brilliant in relation to kinship, wealth and nobility. Secondly, Prince Andrei was not of his first youth and poor health (the old man especially leaned on it), and she was very young. Thirdly, there was a son whom it was a pity to give to the girl. Fourth, finally, - said the father, mockingly looking at his son, - I ask you, put off the case for a year, go abroad, heal, find the Germans, as you want, for Prince Nikolai, and then, if it’s love, passion, stubbornness, what you want, so great, then get married.
  “And this is my last word, know the last ...” the prince finished in such a tone that he showed that nothing would force him to change his mind.
  Prince Andrey clearly saw that the old man hoped that the feeling of his or his future bride would not stand the test of the year, or that he, the old prince, would die by this time, and decided to fulfill his father’s will: make an offer and postpone the wedding for a year.
  Three weeks after his last evening with the Rostovs, Prince Andrei returned to Petersburg.

The day after her explanation with her mother, Natasha waited all day for Bolkonsky, but he did not come. On the other, the third day was the same. Pierre also did not come, and Natasha, not knowing that Prince Andrei had gone to his father, could not explain to himself his absence.
  So three weeks passed. Natasha did not want to go anywhere, and like a shadow, idle and dull, she walked around the rooms, secretly cried from everyone in the evening, and did not come to her mother in the evenings. She blushed incessantly and annoyed. It seemed to her that everyone knew about her disappointment, laughing and regretting her. With all the strength of inner grief, this conceited grief exacerbated her misfortune.
  Once she came to the countess, wanted to say something to her, and suddenly burst into tears. Her tears were the tears of an offended child who himself does not know what he was punished for.
  The countess began to reassure Natasha. Natasha, listening first to her mother’s words, suddenly interrupted her:
  “Stop it, mom, I don’t think, and I don’t want to think!” So, I traveled and stopped, and stopped ...
Her voice trembled, she almost burst into tears, but recovered and calmly continued: “And I really do not want to get married.” And I'm afraid of him; I’ve completely, completely, calmed down now ...
  The day after this conversation, Natasha put on that old dress, which she was especially aware of for the cheerfulness that he delivered in the mornings, and in the morning she began the same way of life that she had lagged behind after the ball. After drinking tea, she went to the hall, which she especially loved for her strong resonance, and began to sing her solfegi (singing exercises). Having finished the first lesson, she stopped in the middle of the hall and repeated one musical phrase, which she especially liked. She listened joyfully to that (as if unexpected for her) charm with which these sounds poured filled the entire void of the hall and slowly froze, and she suddenly felt fun. “There’s so much to think about it so well,” she said to herself, and began to walk back and forth around the hall, not just taking steps on the parquet floor, but at every step stepping from the heel (she wore new, favorite shoes) to her toe, and just as joyfully as the sounds of his voice, listening to that measured heel and creaking sock. Passing by the mirror, she looked into it. - "Here I am!" as if the expression on her face spoke at the sight of herself. “Well, that's good. And I don’t need anyone. ”
  The footman wanted to go in to clean something in the hall, but she did not let him in, again shutting the door behind him, and continued her walk. She returned this morning again to her beloved state of self-love and admiration for herself. - "What a charm this Natasha!" she said again to herself with the words of a third, collective, masculine face. - "Good, voice, young, and she does not bother anyone, leave her alone." But no matter how much she was left alone, she could no longer be dead and immediately felt it.
  The front door of the staircase opened, someone asked: is it at home? and someone's footsteps were heard. Natasha looked in the mirror, but she did not see herself. She listened to the sounds in the front. When she saw herself, her face was pale. It was he. She knew this correctly, although she barely heard the sound of his voice from the shut doors.
  Natasha, pale and frightened, ran into the living room.
  - Mom, Bolkonsky has arrived! - she said. - Mom, this is terrible, it is unbearable! - I do not want ... to suffer! What should I do?…
Even the countess did not have time to answer her, when Prince Andrei with an anxious and serious face entered the living room. As soon as he saw Natasha, his face shone. He kissed the countess and Natasha’s hand and sat beside the sofa.
  “For a long time we had no pleasure ...” the countess began, but Prince Andrei interrupted her, answering her question and obviously in a hurry to say what he needed.
  - I have not been with you all this time, because I was with my father: I needed to talk with him about a very important matter. “I just returned last night,” he said, glancing at Natasha. “I need to speak with you, Countess,” he added after a moment of silence.
  The Countess, with a sigh, lowered her eyes.
  “I am at your service,” she said.
  Natasha knew that she needed to leave, but she could not do this: something was tightening her throat, and she was impolite, directly, with open eyes, looking at Prince Andrei.
  "Now? This very minute! ... No, it cannot be! ” she thought.
  He looked at her again, and this look convinced her that she was not mistaken. - Yes, now, her fate was being decided right now.
  “Come, Natasha, I will call you,” said the countess in a whisper.
  Natasha, with frightened, imploring eyes, looked at Prince Andrey and her mother, and went out.
  “I have arrived, Countess, to ask for your daughter’s hands,” said Prince Andrei. The countess's face flushed, but she said nothing.
  “Your proposal ...” the countess began, sedately. - He was silent, looking into her eyes. “Your offer ... (she was embarrassed), we are pleased, and ... I accept your offer, I am glad.” And my husband ... I hope ... but she herself will depend ...
  “I will tell her when I have your consent ... will you give it to me?” - said Prince Andrew.
  “Yes,” said the countess and held out her hand, and with a mixed sense of estrangement and tenderness pressed her lips to his forehead as he bent over her hand. She wanted to love him like a son; but she felt that he was a stranger and a terrible person for her. “I'm sure my husband will agree,” said the countess, “but your father ...”
  - My father, to whom I informed my plans, laid down an indispensable condition for consent is that the wedding be no earlier than a year. And this is what I wanted to tell you, ”said Prince Andrei.
  - True, Natasha is still young, but for so long.
  “It could not be otherwise,” said Prince Andrew with a sigh.
  “I will send her to you,” said the countess and left the room.
“Lord, have mercy on us,” she asserted, looking for her daughter. Sonya said that Natasha was in the bedroom. Natasha sat on her bed, pale, with dry eyes, looked at the image and, quickly baptized, whispered something. Seeing her mother, she jumped up and rushed to her.
  - What? Mom? ... what?
  - Go, go to him. He asks for your hand, - said the countess coldly, as it seemed to Natasha ... - Go and go, - said the mother with sadness and reproach after the runaway daughter, and sighed heavily.
  Natasha did not remember how she entered the living room. Entering the door and seeing him, she stopped. "Has this stranger really done everything for me now?" she asked herself and instantly replied: "Yes, that's it: he alone is now more expensive for me than anything else." Prince Andrey went up to her, looking down.
  “I fell in love with you the moment I saw you.” Can i hope
  He looked at her, and the serious passion of her expression struck him. Her face said: “Why ask? Why doubt that you cannot not know? Why speak when it is impossible to express in words what you feel. ”
  She approached him and stopped. He took her hand and kissed.
  - Do you love me?
  “Yes, yes,” Natasha spoke as if in frustration, she sighed loudly, another time, more and more often, and sobbed.
  - About what? What's wrong with you?
  “Ah, I'm so happy,” she answered, smiled through her tears, bent closer to him, thought for a second, as if asking herself if this was possible, and kissed him.
  Prince Andrey held her hands, looked into her eyes, and did not find in his soul his former love for her. Something suddenly turned in his soul: there was no previous poetic and mysterious charm of desire, but pity for her female and childish weaknesses, there was a fear of her loyalty and credulity, a heavy and at the same time joyful awareness of the duty that forever bound him to her. The real feeling, although it was not so light and poetic as the former, was more serious and stronger.
  - Did maman tell you that this cannot be earlier than a year? Said Prince Andrei, continuing to look into her eyes. “Is it really me, that girl is a child (everyone said that about me) Natasha thought, am I really from now on a wife equal to this alien, dear, smart personrespected even by my father. Is that really true! is it really true that now it’s impossible to joke with life, now I’m big, now I have the responsibility for all my work and word? Yes, what did he ask me? ”
  “No,” she answered, but she did not understand what he was asking.
“Forgive me,” said Prince Andrei, “but you are so young, and I have already experienced so many lives.” I'm scared for you. You do not know yourself.
  Natasha listened with concentrated attention, trying to understand the meaning of his words and did not understand.
  “No matter how difficult this year will be, delaying my happiness,” continued Prince Andrei, “you will believe yourself in this period.” I ask you in a year to make my happiness; but you are free: our engagement will remain a secret, and if you would have been convinced that you did not love me, or would have loved ... ”said Prince Andrei with an unnatural smile.
  “Why are you saying that?” - interrupted him Natasha. “You know that from the very day you first arrived in Otradnoye, I have loved you,” she said, firmly convinced that she was telling the truth.
  - In a year you will recognize yourself ...
  - A whole year! - suddenly said Natasha, now only realizing that the wedding was postponed for a year. - But why the year? Why year? ... - Prince Andrew began to explain to her the reasons for this delay. Natasha did not listen to him.
  - And it is impossible otherwise? She asked. Prince Andrei did not answer, but his face expressed the impossibility of changing this decision.
  - It's horrible! No, it's terrible, terrible! - suddenly spoke Natasha and sobbed again. - I will die, waiting for the year: it is impossible, it is terrible. She looked into the face of her fiancé and saw on him an expression of compassion and bewilderment.
  “No, no, I will do everything,” she said, suddenly stopping the tears, “I am so happy!” - Father and mother entered the room and blessed the bride and groom.
  From that day on, Prince Andrey began to go to the Rostovs with his fiancé.

There was no betrothal and no one was announced about the engagement of Bolkonsky with Natasha; Prince Andrew insisted on this. He said that since he was the cause of the postponement, he must bear the brunt of it. He said that he had forever bound himself with his word, but that he did not want to bind Natasha and left her complete freedom. If in six months she feels that she does not love him, she will be in her own right if she refuses him. It goes without saying that neither parents nor Natasha wanted to hear about it; but Prince Andrew insisted on his own. Prince Andrey visited the Rostovs every day, but not like the groom treated Natasha: he told her to you and kissed only her hand. Between Prince Andrei and Natasha, after a day of proposal, completely different than before, close, simple relations were established. They seemed to still not know each other. And he and she loved to remember how they looked at each other when they were still nothing, now both of them felt like completely different creatures: then they were feigned, now simple and sincere. At first, the family felt awkward in dealing with Prince Andrei; he seemed to be a man from an alien world, and Natasha had long accustomed the family to Prince Andrei and proudly assured everyone that he only seemed so special, and that he was the same as everyone, and that she was not afraid of him and that no one should be afraid his. After several days, the family got used to him and did not hesitate to live with him the previous way of life in which he took part. He was able to talk about the economy with the count and about the outfits with the countess and Natasha, and about albums and canvases with Sonya. Sometimes the Rostovs at home with each other and under Prince Andrew were surprised at how all this happened and how obvious the omens were: the arrival of Prince Andrei in Otradnoye, and their arrival in St. Petersburg, and the similarities between Natasha and Prince Andrei, which the nanny noticed on her first visit Prince Andrei, and the clash in 1805 between Andrei and Nikolai, and many other omens of what happened, were noticed by the family.
The house was dominated by the poetic boredom and silence that always accompanies the presence of the bride and groom. Often sitting together, everyone was silent. Sometimes they got up and left, and the groom and the bride, remaining alone, were also silent. Rarely did they talk about their future life. Prince Andrew was scared and ashamed to talk about this. Natasha shared this feeling, like all his feelings, which she constantly guessed. Once Natasha began to ask about his son. Prince Andrei blushed what happened to him often now and that Natasha especially loved, and said that his son would not live with them.
  - From what? - Natasha said in fear.
  “I can't take it from my grandfather and then ...”
  - How I would love him! - said Natasha, immediately guessing his thought; but I know you want no excuse to blame you and me.
  The old count sometimes approached Prince Andrei, kissed him, asked him for advice on the upbringing of Petit or the service of Nicholas. The old countess sighed, looking at them. Sonya was afraid to be superfluous every minute and tried to find excuses to leave them alone when they did not need it. When Prince Andrei spoke (he spoke very well), Natasha proudly listened to him; when she spoke, she noted with fear and joy that he was looking at her attentively and inquiringly. She asked herself in bewilderment: “What is he looking for in me? What is he seeking with his eyes! What, if not in me what he is looking for with this look? ” Sometimes she went into her insanely cheerful mood, and then she especially liked to listen and watch how Prince Andrei laughed. He rarely laughed, but when he laughed, he surrendered himself to his laughter, and every time after this laughter she felt closer to him. Natasha would have been completely happy if the thought of the impending and impending separation had not frightened her, since he also grew pale and cold at the mere thought of that.
  On the eve of his departure from St. Petersburg, Prince Andrew brought Pierre with him, who had never been to the Rostovs since the ball. Pierre seemed confused and confused. He was talking to his mother. Natasha sat with Sonya at the chess table, inviting Prince Andrey to her. He went up to them.
  “Have you known Bezukhov for a long time?” - he asked. - Do you love him?
  - Yes, he is glorious, but very funny.
  And she, as always talking about Pierre, began to tell jokes about his absent-mindedness, jokes that even invented him.
“You know, I believed him our secret,” said Prince Andrei. - I have known him since childhood. This is a golden heart. I beg you, Natalie, ”he said suddenly seriously; - I'll leave, God knows what might happen. You can spill ... Well, I know that I should not talk about it. One thing - no matter what happens to you when I am gone ...
  “What will happen?”
  “Whatever grief,” continued Prince Andrei, “I ask you, m lle Sophie, no matter what happens, turn to him alone for advice and help.” This is the most absent-minded and funny person, but the most golden heart.
  Neither father and mother, nor Sonya, nor Prince Andrei himself could have foreseen how the separation from her fiance would affect Natasha. Red and excited, with dry eyes, she walked around the house that day, doing the most insignificant things, as if not understanding what awaited her. She did not cry, and the minute he said goodbye, the last time he kissed her hand. - Do not leave! She only spoke to him in such a voice that made him think about whether he really needed to stay and which he remembered for a long time after that. When he left, she did not cry either; but for several days she sat crying in her room, was not interested in anything, and only said sometimes: “Ah, why did he leave!”
  But two weeks after his departure, she just as unexpectedly for those around her, woke up from her moral illness, became the same as before, but only with altered moral physiognomy, like children with a different face get out of bed after a long illness.

The health and character of Prince Nikolai Andreich Bolkonsky, in this last year  after the departure of his son, weakened very much. He became even more irritable than before, and all the flashes of his causeless anger were mostly falling upon Princess Mary. It was as if he diligently sought out all her sore spots in order to torment her as severely as possible. Princess Mary had two passions and therefore two joys: the nephew of Nikolushka and religion, and both were favorite topics of the prince's attacks and ridicule. Whatever they were talking about, he reduced the conversation to the superstition of old girls or to pampering and spoiling children. - “You want him (Nikolenka) to be made as an old girl like yourself; in vain: Prince Andrei needs a son, not a girl, ”he said. Or, turning to mademoiselle Bourime, he asked her under Princess Marya how she liked our priests and image, and joked ...

This species is also known as the common sea fox, shark fox and sea fox. The habitat extends to tropical and temperate waters. In the Atlantic Ocean, these cartilaginous fish live from Newfoundland to Argentina and from the North Sea to the southern tip of Africa. Found in the Mediterranean Sea. The Indian Ocean are common in its northern part. And in the Pacific Ocean, a fox shark has chosen a zone for itself from Japan to New Zealand and from British Columbia to Chile.

This species is subject to seasonal migrations. It moves to the northern latitudes along with warm bodies of water. Moreover, the range of movement of males is more extensive than females. It is assumed that the populations of the Atlantic, Pacific, and Indian oceans have different life cycle. This is indirectly indicated by the fact that there are no migrations from ocean to ocean. Representatives of the species are deep-sea and live at a depth of up to 550 meters. Only young sharks are sometimes found near the coast.

Description

The body is streamlined, torpedo-shaped with a short wide head. Eyes of medium size, urinary membranes are absent on them. The mouth is small, its shape is curved. On the upper jaw there are 35-52 rows of teeth, on the lower such rows 26-49. The teeth are small, triangular in shape, with notches on them. There are 5 pairs of gill slits.

The main feature of the fox shark is the tail fin. Its upper part is very long and corresponds to the length of the body. With this powerful blade predatory fish  stuns the victim. The pectoral fins are sickle-shaped. The dorsal fin is relatively high and is located approximately in the middle of the back. There is a second tiny dorsal fin. The ventral fins are quite large. The skin is covered with protective placoid scales.

The color of the upper torso varies from purplish brown to gray. The sides are bluish, the belly is white. In length, along with the caudal fin, the fox shark reaches 5 meters and weighs 230 kg. The officially registered maximum length is 5.7 meters. Estimated maximum length can reach 6.5 meters. And the hardest caught was the female. With a body length of 4.8 meters, she weighed 510 kg.

Reproduction and longevity

This species belongs to ovoviviparous. Pregnancy lasts 9 months. In the litter there are from 2 to 7 newborns. They appear from March to June. They reach a length of 12-16 cm, weigh 5-6 kg and add 50 cm each year. Adult fox sharks grow 10 cm per year. Sexual maturity in males occurs with a body length of 3-3.2 meters. Females mature at a length of 2.5-4.5 meters. AT wildlife  fox shark lives 15-20 years. The maximum life span reaches 50 years.

Behavior and Nutrition

The main diet consists of schooling fish such as mackerel, herring, garfish, anchovies, squids and invertebrates are also eaten. Fish hunting is carried out singly or in groups. Sharks with their long tails drive the victims into a dense pile and swallow. In addition, ordinary fox sharks can stifle prey with tails. In this way, they attack sea lions and seabirds. However, this happens when there are few fish. If there is a lot of it, then only she is eaten.

Conservation status

At the beginning of the XXI century, this species received the status of vulnerable. Associated with commercial overfishing. Representatives of the species value meat and fins. Vitamins are obtained from the liver, and the skin is secreted. Fox sharks are currently protected by law. The catch of these cartilaginous fish has decreased, but poachers still cause some damage to this species.

Share this: